What is the total number of valence electrons in a calcium atom in the ground state?

(1) 8 (3) 18

(2) 2 (4) 20

Which are produced when HCl reacts with Ca (OH) 2?

How might a lack of sunlight disrupt the food web?

How does decreasing the temperature affect the volume of a gas?

Which tool made it possible to discover cells?

Which system includes oxygen, nitrogen, and ozone?

Aight imma let you guys i

In which choice is the ellipsis used correctly to select from this sentence from The Scarlet Letter? A throng of bearded men, in sad-coloured garments and grey steeple-crowned hats, inter-mixed with women, some wearing hoods, and others bareheaded,

Explain the difference between the greenhouse effect and global warming.

How does adding salt affect the surface tension of water? if it increases surface tension, will it always increase it?

Which usually has a higher temperature? A city or the areas around the city?